from django.views.decorators.cache import cache_page
from django.shortcuts import render
from django.http import HttpResponse, HttpResponseRedirect
from .models import Question, Choice
# from django.template import loader
# from django.http import Http404
from django.shortcuts import get_object_or_404
from django.urls import reverse
from django.db.models import F
from django.views import generic
from django.utils import timezone


# Create your views here.
@cache_page(60 * 15)
def index(request):
    latest_question_list = Question.objects.order_by('pub_data')[:5]
    # template = loader.get_template('polls/index.html')
    context = {
        'latest_question_list': latest_question_list
    }
    # output = ', '.join(q.question_text for q in latest_question_list)
    # return HttpResponse(template.render(context, request))
    return render(request, 'polls/index.html', context)
#
#
# def detail(request, question_id):
#     # try:
#     #     question = Question.objects.get(pk=question_id)
#     # except Question.DoesNotExist:
#     #     raise Http404("Question does not exist")
#     # return HttpResponse("You are looking at question %s." % question_id)
#     question = get_object_or_404(Question, pk=question_id)
#     return render(request, 'polls/detail.html', {'question': question})
#
#
# def results(request, question_id):
#     # response = "You are looking at the results of question %s."
#     # return HttpResponse(response % question_id)
#     question = get_object_or_404(Question, pk=question_id)
#     return render(request, 'polls/results.html', {'question': question})


def vote(request, question_id):
    # return HttpResponse("You are voting on question %s." % question_id)
    question = get_object_or_404(Question, pk=question_id)
    try:
        selected_choice = question.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
        # Redisplay the question voting form.
        return render(request, 'polls/detail.html', {
            'question': question,
            'error_message': "You didn't select a choice.",
        })
    else:
        selected_choice.votes = F('votes') + 1
        selected_choice.save()
        return HttpResponseRedirect(reverse('polls:results', args=(question.id,)))


class IndexView(generic.ListView):
    template_name = 'polls/index.html'
    context_object_name = 'latest_question_list'

    def get_queryset(self):
        """Return the list five published questions (not including those set to be published in the future)."""
        return Question.objects.filter(pub_data__lte=timezone.now()).order_by('pub_data')[:5]


class DetailView(generic.DetailView):
    model = Question
    template_name = 'polls/detail.html'

    def get_queryset(self):
        """
        Excludes any questions that aren't published yet.
        :return:
        """
        return Question.objects.filter(pub_data__lte=timezone.now())


class ResultsView(generic.DetailView):
    model = Question
    template_name = 'polls/results.html'
